Goliath @ SFNE (RIP) was the best boomerang I've ridden by a long way.
Stinger @ Dorney (also RIP) and Invertigo @Kings Island were both pretty good, to the extent that I would have re-ridden them.
Family Boomerangs are great for what they are, inoffensive.
Standard ones can go to hell. Accidentally re-rode a relocated boomerang at SFStl
I try to get them out of the way early now while I'm fully hydrated, usually the effects wear off after half an hour or so.
The only "Standard" one I enjoyed was the one at Hershey, I think because I was facing the other way so the backwards part was first, then went forwards on the return leg.